X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/42ff4c2eab9341478afec7d34adcc8aaef51df20..ede9137980d8582754d6276d8d30f6c0fc02702f:/usr/src/sys/ufs/lfs/lfs_vfsops.c

diff --git a/usr/src/sys/ufs/lfs/lfs_vfsops.c b/usr/src/sys/ufs/lfs/lfs_vfsops.c
index 71c6ef1bad..34aac29662 100644
--- a/usr/src/sys/ufs/lfs/lfs_vfsops.c
+++ b/usr/src/sys/ufs/lfs/lfs_vfsops.c
@@ -1,379 +1,521 @@
 /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved.  The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * Copyright (c) 1989, 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
  *
- *	@(#)lfs_vfsops.c	7.5 (Berkeley) %G%
+ * %sccs.include.redist.c%
+ *
+ *	@(#)lfs_vfsops.c	8.6 (Berkeley) %G%
  */
 
-#include "param.h"
-#include "systm.h"
-#include "dir.h"
-#include "user.h"
-#include "inode.h"
-#include "proc.h"
-#include "fs.h"
-#include "buf.h"
-#include "mount.h"
-#include "file.h"
-#include "conf.h"
-#include "ioctl.h"
-#include "disklabel.h"
-#include "stat.h"
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/namei.h>
+#include <sys/proc.h>
+#include <sys/kernel.h>
+#include <sys/vnode.h>
+#include <sys/mount.h>
+#include <sys/buf.h>
+#include <sys/mbuf.h>
+#include <sys/file.h>
+#include <sys/disklabel.h>
+#include <sys/ioctl.h>
+#include <sys/errno.h>
+#include <sys/malloc.h>
+#include <sys/socket.h>
+
+#include <miscfs/specfs/specdev.h>
 #include "ioctl.h"
 #include "disklabel.h"
 #include "stat.h"
 
-smount()
+#include <ufs/ufs/quota.h>
+#include <ufs/ufs/inode.h>
+#include <ufs/ufs/ufsmount.h>
+#include <ufs/ufs/ufs_extern.h>
+
+#include <ufs/lfs/lfs.h>
+#include <ufs/lfs/lfs_extern.h>
+
+int lfs_mountfs __P((struct vnode *, struct mount *, struct proc *));
+
+struct vfsops lfs_vfsops = {
+	lfs_mount,
+	ufs_start,
+	lfs_unmount,
+	lfs_root,
+	ufs_quotactl,
+	lfs_statfs,
+	lfs_sync,
+	lfs_vget,
+	lfs_fhtovp,
+	lfs_vptofh,
+	lfs_init,
+};
+
+int
+lfs_mountroot()
 {
-	register struct a {
-		char	*fspec;
-		char	*freg;
-		int	ronly;
-	} *uap = (struct a *)u.u_ap;
-	dev_t dev;
-	register struct inode *ip;
-	register struct fs *fs;
-	register struct nameidata *ndp = &u.u_nd;
-	u_int len;
-
-	u.u_error = getmdev(&dev, uap->fspec);
-	if (u.u_error)
-		return;
-	ndp->ni_nameiop = LOOKUP | FOLLOW;
-	ndp->ni_segflg = UIO_USERSPACE;
-	ndp->ni_dirp = (caddr_t)uap->freg;
-	ip = namei(ndp);
-	if (ip == NULL)
-		return;
-	if (ip->i_count != 1) {
-		iput(ip);
-		u.u_error = EBUSY;
-		return;
+	panic("lfs_mountroot");		/* XXX -- implement */
+}
+
+/*
+ * VFS Operations.
+ *
+ * mount system call
+ */
+lfs_mount(mp, path, data, ndp, p)
+	register struct mount *mp;
+	char *path;
+	caddr_t data;
+	struct nameidata *ndp;
+	struct proc *p;
+{
+	struct vnode *devvp;
+	struct ufs_args args;
+	struct ufsmount *ump;
+	register struct lfs *fs;				/* LFS */
+	u_int size;
+	int error;
+
+	if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
+		return (error);
+
+	/* Until LFS can do NFS right.		XXX */
+	if (args.export.ex_flags & MNT_EXPORTED)
+		return (EINVAL);
+
+	/*
+	 * If updating, check whether changing from read-only to
+	 * read/write; if there is no device name, that's all we do.
+	 */
+	if (mp->mnt_flag & MNT_UPDATE) {
+		ump = VFSTOUFS(mp);
+#ifdef NOTLFS							/* LFS */
+		fs = ump->um_fs;
+		if (fs->fs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
+			fs->fs_ronly = 0;
+#else
+		fs = ump->um_lfs;
+		if (fs->lfs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
+			fs->lfs_ronly = 0;
+#endif
+		if (args.fspec == 0) {
+			/*
+			 * Process export requests.
+			 */
+			return (vfs_export(mp, &ump->um_export, &args.export));
+		}
+	}
+	/*
+	 * Not an update, or updating the name: look up the name
+	 * and verify that it refers to a sensible block device.
+	 */
+	NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
+	if (error = namei(ndp))
+		return (error);
+	devvp = ndp->ni_vp;
+	if (devvp->v_type != VBLK) {
+		vrele(devvp);
+		return (ENOTBLK);
+	}
+	if (major(devvp->v_rdev) >= nblkdev) {
+		vrele(devvp);
+		return (ENXIO);
 	}
-	if ((ip->i_mode&IFMT) != IFDIR) {
-		iput(ip);
-		u.u_error = ENOTDIR;
-		return;
+	if ((mp->mnt_flag & MNT_UPDATE) == 0)
+		error = lfs_mountfs(devvp, mp, p);		/* LFS */
+	else {
+		if (devvp != ump->um_devvp)
+			error = EINVAL;	/* needs translation */
+		else
+			vrele(devvp);
 	}
-	fs = mountfs(dev, uap->ronly, ip);
-	if (fs == 0)
-		return;
-	(void) copyinstr(uap->freg, fs->fs_fsmnt, sizeof(fs->fs_fsmnt)-1, &len);
-	bzero(fs->fs_fsmnt + len, sizeof (fs->fs_fsmnt) - len);
+	if (error) {
+		vrele(devvp);
+		return (error);
+	}
+	ump = VFSTOUFS(mp);
+	fs = ump->um_lfs;					/* LFS */
+#ifdef NOTLFS							/* LFS */
+	(void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
+	bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
+	bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
+	    MNAMELEN);
+	(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
+	    &size);
+	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
+	(void) ufs_statfs(mp, &mp->mnt_stat, p);
+#else
+	(void)copyinstr(path, fs->lfs_fsmnt, sizeof(fs->lfs_fsmnt) - 1, &size);
+	bzero(fs->lfs_fsmnt + size, sizeof(fs->lfs_fsmnt) - size);
+	bcopy((caddr_t)fs->lfs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
+	    MNAMELEN);
+	(void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
+	    &size);
+	bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
+	(void) lfs_statfs(mp, &mp->mnt_stat, p);
+#endif
+	return (0);
 }
 
-/* this routine has races if running twice */
-struct fs *
-mountfs(dev, ronly, ip)
-	dev_t dev;
-	int ronly;
-	struct inode *ip;
+/*
+ * Common code for mount and mountroot
+ * LFS specific
+ */
+int
+lfs_mountfs(devvp, mp, p)
+	register struct vnode *devvp;
+	struct mount *mp;
+	struct proc *p;
 {
-	register struct mount *mp = 0;
-	struct buf *tp = 0;
-	register struct buf *bp = 0;
-	register struct fs *fs;
+	extern struct vnode *rootvp;
+	register struct lfs *fs;
+	register struct ufsmount *ump;
+	struct vnode *vp;
+	struct buf *bp;
 	struct partinfo dpart;
-	int havepart = 0, blks;
-	caddr_t space;
-	int i, size;
-	register error;
-	int needclose = 0;
-
-	error =
-	    (*bdevsw[major(dev)].d_open)(dev, ronly ? FREAD : FREAD|FWRITE,
-	        S_IFBLK);
-	if (error)
-		goto out;
-	needclose = 1;
-	if ((*bdevsw[major(dev)].d_ioctl)(dev, DIOCGPART,
-	    (caddr_t)&dpart, FREAD) == 0) {
-		havepart = 1;
-		size = dpart.disklab->d_secsize;
-	} else
+	dev_t dev;
+	int error, i, ronly, size;
+
+	if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p))
+		return (error);
+
+	if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
 		size = DEV_BSIZE;
-#ifdef SECSIZE
-	/*
-	 * If possible, determine hardware sector size
-	 * and adjust fsbtodb to correspond.
-	 */
-#endif SECSIZE
-	if ((*bdevsw[major(dev)].d_ioctl)(dev, DIOCGPART,
-	    (caddr_t)&dpart, FREAD) == 0) {
-		havepart = 1;
+	else {
 		size = dpart.disklab->d_secsize;
-#ifdef SECSIZE
-		if (size < MINSECSIZE) {
-			error = EINVAL;
-			goto out;
-		}
-#endif SECSIZE
-	} else
-		size = DEV_BSIZE;
-#ifdef SECSIZE
-	tp = bread(dev, (daddr_t)(SBOFF / size), SBSIZE, size);
-#else SECSIZE
-	tp = bread(dev, SBLOCK, SBSIZE);
-#endif SECSIZE
-	if (tp->b_flags & B_ERROR)
+#ifdef NEVER_USED
+		dpart.part->p_fstype = FS_LFS;
+		dpart.part->p_fsize = fs->lfs_fsize;	/* frag size */
+		dpart.part->p_frag = fs->lfs_frag;	/* frags per block */
+		dpart.part->p_cpg = fs->lfs_segshift;	/* segment shift */
+#endif
+	}
+
+	/* Don't free random space on error. */
+	bp = NULL;
+	ump = NULL;
+
+	/* Read in the superblock. */
+	if (error = bread(devvp, LFS_LABELPAD / size, LFS_SBPAD, NOCRED, &bp))
 		goto out;
-	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
-		if (mp->m_bufp != 0 && dev == mp->m_dev) {
-			mp = 0;
-			error = EBUSY;
-			goto out;
-		}
-	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
-		if (mp->m_bufp == 0)
-			goto found;
-	mp = 0;
-	error = EMFILE;		/* needs translation */
-	goto out;
-found:
-	mp->m_bufp = tp;	/* just to reserve this slot */
-	mp->m_dev = NODEV;
-	fs = tp->b_un.b_fs;
-	if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
-	    fs->fs_bsize < sizeof(struct fs)) {
-		error = EINVAL;		/* also needs translation */
+		error = EINVAL;		/* XXX needs translation */
 		goto out;
 	}
-	bp = geteblk((int)fs->fs_sbsize);
-	mp->m_bufp = bp;
-	bcopy((caddr_t)tp->b_un.b_addr, (caddr_t)bp->b_un.b_addr,
-	   (u_int)fs->fs_sbsize);
-	brelse(tp);
-	tp = 0;
-	fs = bp->b_un.b_fs;
-	fs->fs_ronly = (ronly != 0);
+
+	/* Allocate the mount structure, copy the superblock into it. */
+	ump = (struct ufsmount *)malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
+	fs = ump->um_lfs = malloc(sizeof(struct lfs), M_UFSMNT, M_WAITOK);
+	bcopy(bp->b_data, fs, sizeof(struct lfs));
+	if (sizeof(struct lfs) < LFS_SBPAD)			/* XXX why? */
+		bp->b_flags |= B_INVAL;
+	brelse(bp);
+	bp = NULL;
+
+	/* Set up the I/O information */
+	fs->lfs_iocount = 0;
+
+	/* Set up the ifile and lock aflags */
+	fs->lfs_doifile = 0;
+	fs->lfs_writer = 0;
+	fs->lfs_dirops = 0;
+	fs->lfs_seglock = 0;
+
+	/* Set the file system readonly/modify bits. */
+	fs->lfs_ronly = ronly;
 	if (ronly == 0)
-		fs->fs_fmod = 1;
-	if (havepart) {
-		dpart.part->p_fstype = FS_BSDFFS;
-		dpart.part->p_fsize = fs->fs_fsize;
-		dpart.part->p_frag = fs->fs_frag;
-		dpart.part->p_cpg = fs->fs_cpg;
-		fs->fs_dbsize = size;
-	}
-#ifdef SECSIZE
+		fs->lfs_fmod = 1;
+
+	/* Initialize the mount structure. */
+	dev = devvp->v_rdev;
+	mp->mnt_data = (qaddr_t)ump;
+	mp->mnt_stat.f_fsid.val[0] = (long)dev;
+	mp->mnt_stat.f_fsid.val[1] = MOUNT_LFS;
+	mp->mnt_flag |= MNT_LOCAL;
+	ump->um_mountp = mp;
+	ump->um_dev = dev;
+	ump->um_devvp = devvp;
+	ump->um_bptrtodb = 0;
+	ump->um_seqinc = 1 << fs->lfs_fsbtodb;
+	ump->um_nindir = fs->lfs_nindir;
+	for (i = 0; i < MAXQUOTAS; i++)
+		ump->um_quotas[i] = NULLVP;
+	devvp->v_specflags |= SI_MOUNTEDON;
+
 	/*
-	 * If we have a disk label, force per-partition
-	 * filesystem information to be correct
-	 * and set correct current fsbtodb shift.
+	 * We use the ifile vnode for almost every operation.  Instead of
+	 * retrieving it from the hash table each time we retrieve it here,
+	 * artificially increment the reference count and keep a pointer
+	 * to it in the incore copy of the superblock.
 	 */
-#endif SECSIZE
-	if (havepart) {
-		dpart.part->p_fstype = FS_BSDFFS;
-		dpart.part->p_fsize = fs->fs_fsize;
-		dpart.part->p_frag = fs->fs_frag;
-#ifdef SECSIZE
-#ifdef tahoe
-		/*
-		 * Save the original fsbtodb shift to restore on updates.
-		 * (Console doesn't understand fsbtodb changes.)
-		 */
-		fs->fs_sparecon[0] = fs->fs_fsbtodb;
-#endif
-		i = fs->fs_fsize / size;
-		for (fs->fs_fsbtodb = 0; i > 1; i >>= 1)
-			fs->fs_fsbtodb++;
-#endif SECSIZE
-		fs->fs_dbsize = size;
-	}
-	blks = howmany(fs->fs_cssize, fs->fs_fsize);
-	space = wmemall(vmemall, (int)fs->fs_cssize);
-	if (space == 0) {
-		error = ENOMEM;
+	if (error = VFS_VGET(mp, LFS_IFILE_INUM, &vp))
 		goto out;
-	}
-	for (i = 0; i < blks; i += fs->fs_frag) {
-		size = fs->fs_bsize;
-		if (i + fs->fs_frag > blks)
-			size = (blks - i) * fs->fs_fsize;
-#ifdef SECSIZE
-		tp = bread(dev, fsbtodb(fs, fs->fs_csaddr + i), size,
-		    fs->fs_dbsize);
-#else SECSIZE
-		tp = bread(dev, fsbtodb(fs, fs->fs_csaddr + i), size);
-#endif SECSIZE
-		if (tp->b_flags&B_ERROR) {
-			wmemfree(space, (int)fs->fs_cssize);
-			goto out;
-		}
-		bcopy((caddr_t)tp->b_un.b_addr, space, (u_int)size);
-		fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space;
-		space += size;
-		brelse(tp);
-		tp = 0;
-	}
-	mp->m_inodp = ip;
-	mp->m_dev = dev;
-	if (ip) {
-		ip->i_flag |= IMOUNT;
-		cacheinval(ip);
-		iunlock(ip);
-	}
-	/* Sanity checks for old file systems.			   XXX */
-	fs->fs_npsect = MAX(fs->fs_npsect, fs->fs_nsect);	/* XXX */
-	fs->fs_interleave = MAX(fs->fs_interleave, 1);		/* XXX */
+	fs->lfs_ivnode = vp;
+	VREF(vp);
+	vput(vp);
 
 
-	return (fs);
+	return (0);
 out:
-	if (error == 0)
-		error = EIO;
-	if (needclose && ip)
-		(void) closei((dev_t)ip->i_rdev, IFBLK,
-		    ronly? FREAD : FREAD|FWRITE);
-	if (needclose)
-		(void) closei((dev_t)ip->i_rdev, IFBLK,
-		    ronly? FREAD : FREAD|FWRITE);
-	if (ip)
-		iput(ip);
-	if (mp)
-		mp->m_bufp = 0;
 	if (bp)
 		brelse(bp);
-	if (tp)
-		brelse(tp);
-	u.u_error = error;
+	(void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
+	if (ump) {
+		free(ump->um_lfs, M_UFSMNT);
+		free(ump, M_UFSMNT);
+		mp->mnt_data = (qaddr_t)0;
+	}
+	return (error);
+}
+
+/*
+ * unmount system call
+ */
+lfs_unmount(mp, mntflags, p)
+	struct mount *mp;
+	int mntflags;
+	struct proc *p;
+{
+	extern int doforce;
+	register struct ufsmount *ump;
+	register struct lfs *fs;
+	int i, error, flags, ronly;
+
+	flags = 0;
+	if (mntflags & MNT_FORCE) {
+		if (!doforce || (mp->mnt_flag & MNT_ROOTFS))
+			return (EINVAL);
+		flags |= FORCECLOSE;
+	}
+
+	ump = VFSTOUFS(mp);
+	fs = ump->um_lfs;
+		return (error);
+#ifdef QUOTA
+	if (mp->mnt_flag & MNT_QUOTA) {
+		if (error = vflush(mp, fs->lfs_ivnode, SKIPSYSTEM|flags))
+			return (error);
+		for (i = 0; i < MAXQUOTAS; i++) {
+			if (ump->um_quotas[i] == NULLVP)
+				continue;
+			quotaoff(p, mp, i);
+		}
+		/*
+		 * Here we fall through to vflush again to ensure
+		 * that we have gotten rid of all the system vnodes.
+		 */
+	}
+#endif
+	if (error = vflush(mp, fs->lfs_ivnode, flags))
+		return (error);
+	fs->lfs_clean = 1;
+	if (error = VFS_SYNC(mp, 1, p->p_ucred, p))
+		return (error);
+	if (fs->lfs_ivnode->v_dirtyblkhd.lh_first)
+		panic("lfs_unmount: still dirty blocks on ifile vnode\n");
+	vrele(fs->lfs_ivnode);
+	vgone(fs->lfs_ivnode);
+
+	ronly = !fs->lfs_ronly;
+ * Get file system statistics.
+ */
+lfs_statfs(mp, sbp, p)
+	struct mount *mp;
+	register struct statfs *sbp;
+	struct proc *p;
+{
+	register struct lfs *fs;
+	register struct ufsmount *ump;
+
+	ump = VFSTOUFS(mp);
+	fs = ump->um_lfs;
+	if (fs->lfs_magic != LFS_MAGIC)
+		panic("lfs_statfs: magic");
+	sbp->f_type = MOUNT_LFS;
+	sbp->f_bsize = fs->lfs_bsize;
+	sbp->f_iosize = fs->lfs_bsize;
+	sbp->f_blocks = dbtofsb(fs,fs->lfs_dsize);
+	sbp->f_bfree = dbtofsb(fs, fs->lfs_bfree);
+	sbp->f_bavail = (fs->lfs_dsize * (100 - fs->lfs_minfree) / 100) -
+		(fs->lfs_dsize - fs->lfs_bfree);
+	sbp->f_bavail = dbtofsb(fs, sbp->f_bavail);
+	sbp->f_files = fs->lfs_nfiles;
+	sbp->f_ffree = sbp->f_bfree * INOPB(fs);
+	if (sbp != &mp->mnt_stat) {
+		bcopy((caddr_t)mp->mnt_stat.f_mntonname,
+			(caddr_t)&sbp->f_mntonname[0], MNAMELEN);
+		bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
+			(caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
+	}
 	return (0);
 }
 
-umount()
+/*
+ * Go through the disk queues to initiate sandbagged IO;
+ * go through the inodes to write those that have been modified;
+ * initiate the writing of the super block if it has been modified.
+ *
+ * Note: we are always called with the filesystem marked `MPBUSY'.
+ */
+lfs_sync(mp, waitfor, cred, p)
+	struct mount *mp;
+	int waitfor;
+	struct ucred *cred;
+	struct proc *p;
 {
-	struct a {
-		char	*fspec;
-	} *uap = (struct a *)u.u_ap;
+	int error;
 
-	u.u_error = unmount1(uap->fspec, 0);
+	/* All syncs must be checkpoints until roll-forward is implemented. */
+	error = lfs_segwrite(mp, SEGM_CKP | (waitfor ? SEGM_SYNC : 0));
+#ifdef QUOTA
+	qsync(mp);
+#endif
+	return (error);
 }
 
-unmount1(fname, forcibly)
-	caddr_t fname;
-	int forcibly;
+/*
+ * Look up an LFS dinode number to find its incore vnode.  If not already
+ * in core, read it in from the specified device.  Return the inode locked.
+ * Detection and handling of mount points must be done by the calling routine.
+ */
+int
+lfs_vget(mp, ino, vpp)
+	struct mount *mp;
+	ino_t ino;
+	struct vnode **vpp;
 {
+	register struct lfs *fs;
+	register struct inode *ip;
+	struct buf *bp;
+	struct ifile *ifp;
+	struct vnode *vp;
+	struct ufsmount *ump;
+	daddr_t daddr;
 	dev_t dev;
-	register struct mount *mp;
 	int error;
-	register struct inode *ip;
-	register struct fs *fs;
 
-	forcibly = 0;					/* XXX */
-	forcibly = 0;					/* XXX */
-	error = getmdev(&dev, fname);
-	if (error)
+	ump = VFSTOUFS(mp);
+	dev = ump->um_dev;
+	if ((*vpp = ufs_ihashget(dev, ino)) != NULL)
+		return (0);
+
+	/* Translate the inode number to a disk address. */
+	fs = ump->um_lfs;
+	if (ino == LFS_IFILE_INUM)
+		daddr = fs->lfs_idaddr;
+	else {
+		LFS_IENTRY(ifp, fs, ino, bp);
+		daddr = ifp->if_daddr;
+		brelse(bp);
+		if (daddr == LFS_UNUSED_DADDR)
+			return (ENOENT);
+	}
+
+	/* Allocate new vnode/inode. */
+	if (error = lfs_vcreate(mp, ino, &vp)) {
+		*vpp = NULL;
 		return (error);
-	for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++)
-		if (mp->m_bufp != NULL && dev == mp->m_dev)
-			goto found;
-	return (EINVAL);
-found:
-	xumount(dev);	/* remove unused sticky files from text table */
-	nchinval(dev);	/* flush the name cache */
-	update();
-#ifdef QUOTA
-	if ((error = iflush(dev, mp->m_qinod)) && !forcibly)
-#else
-	if ((error = iflush(dev)) && !forcibly)
-#endif
+	}
+
+	/*
+	 * Put it onto its hash chain and lock it so that other requests for
+	 * this inode will block if they arrive while we are sleeping waiting
+	 * for old data structures to be purged or for the contents of the
+	 * disk portion of this inode to be read.
+	 */
+	ip = VTOI(vp);
+	ufs_ihashins(ip);
+
+	/*
+	 * XXX
+	 * This may not need to be here, logically it should go down with
+	 * the i_devvp initialization.
+	 * Ask Kirk.
+	 */
+	ip->i_lfs = ump->um_lfs;
+
+	/* Read in the disk contents for the inode, copy into the inode. */
+	if (error =
+	    bread(ump->um_devvp, daddr, (int)fs->lfs_bsize, NOCRED, &bp)) {
+		/*
+		 * The inode does not contain anything useful, so it would
+		 * be misleading to leave it on its hash chain. With mode
+		 * still zero, it will be unlinked and returned to the free
+		 * list by vput().
+		 */
+		vput(vp);
+		brelse(bp);
+		*vpp = NULL;
 		return (error);
-#ifdef QUOTA
-	closedq(mp);
+	}
+	ip->i_din = *lfs_ifind(fs, ino, (struct dinode *)bp->b_data);
+	brelse(bp);
+
 	/*
-	 * Here we have to iflush again to get rid of the quota inode.
-	 * A drag, but it would be ugly to cheat, & this doesn't happen often.
+	 * Initialize the vnode from the inode, check for aliases.  In all
+	 * cases re-init ip, the underlying vnode/inode may have changed.
 	 */
-	(void)iflush(dev, (struct inode *)NULL);
-#endif
-	ip = mp->m_inodp;
-	ip->i_flag &= ~IMOUNT;
-	fs = mp->m_bufp->b_un.b_fs;
-	wmemfree((caddr_t)fs->fs_csp[0], (int)fs->fs_cssize);
-	brelse(mp->m_bufp);
-	mp->m_bufp = 0;
-	mp->m_dev = 0;
-	mpurge(mp - &mount[0]);
-	error = closei(dev, IFBLK, fs->fs_ronly? FREAD : FREAD|FWRITE);
-	irele(ip);
-	return (error);
+	if (error = ufs_vinit(mp, lfs_specop_p, LFS_FIFOOPS, &vp)) {
+		vput(vp);
+		*vpp = NULL;
+		return (error);
+	}
+	/*
+	 * Finish inode initialization now that aliasing has been resolved.
+	 */
+	ip->i_devvp = ump->um_devvp;
+	VREF(ip->i_devvp);
+	*vpp = vp;
+	return (0);
 }
 
-sbupdate(mp)
-	struct mount *mp;
+/*
+ * File handle to vnode
+ *
+ * Have to be really careful about stale file handles:
+ * - check that the inode number is valid
+ * - call lfs_vget() to get the locked inode
+ * - check for an unallocated inode (i_mode == 0)
+ * - check that the given client host has export rights and return
+ *   those rights via. exflagsp and credanonp
+ *
+ * XXX
+ * use ifile to see if inode is allocated instead of reading off disk
+ * what is the relationship between my generational number and the NFS
+ * generational number.
+ */
+int
+lfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
+	register struct mount *mp;
+	struct fid *fhp;
+	struct mbuf *nam;
+	struct vnode **vpp;
+	int *exflagsp;
+	struct ucred **credanonp;
 {
-	register struct fs *fs = mp->m_bufp->b_un.b_fs;
-	register struct buf *bp;
-	int blks;
-	caddr_t space;
-	int i, size;
-
-#ifdef SECSIZE
-	bp = getblk(mp->m_dev, (daddr_t)fsbtodb(fs, SBOFF / fs->fs_fsize),
-	    (int)fs->fs_sbsize, fs->fs_dbsize);
-#else SECSIZE
-	bp = getblk(mp->m_dev, SBLOCK, (int)fs->fs_sbsize);
-#endif SECSIZE
-	bcopy((caddr_t)fs, bp->b_un.b_addr, (u_int)fs->fs_sbsize);
-#ifdef SECSIZE
-#ifdef tahoe
-	/* restore standard fsbtodb shift */
-	bp->b_un.b_fs->fs_fsbtodb = fs->fs_sparecon[0];
-	bp->b_un.b_fs->fs_sparecon[0] = 0;
-#endif
-#endif SECSIZE
-	bwrite(bp);
-	blks = howmany(fs->fs_cssize, fs->fs_fsize);
-	space = (caddr_t)fs->fs_csp[0];
-	for (i = 0; i < blks; i += fs->fs_frag) {
-		size = fs->fs_bsize;
-		if (i + fs->fs_frag > blks)
-			size = (blks - i) * fs->fs_fsize;
-#ifdef SECSIZE
-		bp = getblk(mp->m_dev, fsbtodb(fs, fs->fs_csaddr + i), size,
-		    fs->fs_dbsize);
-#else SECSIZE
-		bp = getblk(mp->m_dev, fsbtodb(fs, fs->fs_csaddr + i), size);
-#endif SECSIZE
-		bcopy(space, bp->b_un.b_addr, (u_int)size);
-		space += size;
-		bwrite(bp);
-	}
+	register struct ufid *ufhp;
+
+	ufhp = (struct ufid *)fhp;
+	if (ufhp->ufid_ino < ROOTINO)
+		return (ESTALE);
+	return (ufs_check_export(mp, ufhp, nam, vpp, exflagsp, credanonp));
 }
 
 /*
- * Common code for mount and umount.
- * Check that the user's argument is a reasonable
- * thing on which to mount, and return the device number if so.
+ * Vnode pointer to File handle
  */
-getmdev(pdev, fname)
-	caddr_t fname;
-	dev_t *pdev;
+/* ARGSUSED */
+lfs_vptofh(vp, fhp)
+	struct vnode *vp;
+	struct fid *fhp;
 {
-	dev_t dev;
 	register struct inode *ip;
-	register struct nameidata *ndp = &u.u_nd;
-
-	if (!suser())
-		return (u.u_error);
-	ndp->ni_nameiop = LOOKUP | FOLLOW;
-	ndp->ni_segflg = UIO_USERSPACE;
-	ndp->ni_dirp = fname;
-	ip = namei(ndp);
-	if (ip == NULL) {
-		if (u.u_error == ENOENT)
-			return (ENODEV); /* needs translation */
-		return (u.u_error);
-	}
-	if ((ip->i_mode&IFMT) != IFBLK) {
-		iput(ip);
-		return (ENOTBLK);
-	}
-	dev = (dev_t)ip->i_rdev;
-	iput(ip);
-	if (major(dev) >= nblkdev)
-		return (ENXIO);
-	*pdev = dev;
+	register struct ufid *ufhp;
+
+	ip = VTOI(vp);
+	ufhp = (struct ufid *)fhp;
+	ufhp->ufid_len = sizeof(struct ufid);
+	ufhp->ufid_ino = ip->i_number;
+	ufhp->ufid_gen = ip->i_gen;
 	return (0);
 }